Exact model reference
13-inch MacBook Air (M4, 2025)
Manufacturer-listed battery energy
53.8 Wh
2026-10-17
Device charging evidence
Manufacturer-published system ratings for this version:
- 20 V × 1.5 A (30.0 W)
- 20 V × 1.75 A (35.0 W)
- 20 V × 3 A (60.0 W)
- 20.6 V × 3.4 A (70.0 W)
System-rating OEM source · checked 2026-10-17
These are published system ratings, not measured sustained consumption or a guaranteed minimum input.
Adapter rating is separate
Bundled adapter varies by GPU configuration; Apple lists 30W or 35W adapters and an optional 70W fast-charge adapter.
30 / 35 W configuration range
Optional fast-charge adapter target: 70 W (OEM tech specs).
Adapter-rating OEM source · checked 2026-10-17
The adapter rating is not automatically a minimum input for the device. A lower-output bank may simply deliver less power or charge more slowly; exact behavior remains model- and load-dependent.
Bank-side evidence · dated manufacturer profiles
Sourced voltage/current point matches
Each listed point matches a published device system rating by voltage and available current, within that port’s watt ceiling. PD protocol, cable and device behavior remain separate conditions.
| Bank | Selected port rating | Fixed profile listed | Reading |
|---|---|---|---|
 | 140 W | 20 V / 5 A | Conditional rating-point matchThe bank dossier lists 20V / 5A at this port, covering the device’s published 20V / 1.5A system rating (30W). That numeric point does not by itself establish USB PD protocol qualification, device certification or actual load.Use a USB-C cable rated for this profile. The bank dossier does not establish cable or PD-version qualification.Bank source · checked 2026-10-07 |
 | 140 W | 20 V / 5 A | Conditional rating-point matchThe bank dossier lists 20V / 5A at this port, covering the device’s published 20V / 1.5A system rating (30W). That numeric point does not by itself establish USB PD protocol qualification, device certification or actual load.Use a USB-C cable rated for this profile. The bank dossier does not establish cable or PD-version qualification.Bank source · checked 2026-10-07 |
 | 140 W | 20 V / 5 A | Conditional rating-point matchThe bank dossier lists 20V / 5A at this port, covering the device’s published 20V / 1.5A system rating (30W). That numeric point does not by itself establish USB PD protocol qualification, device certification or actual load.Use a USB-C cable rated for this profile. The bank dossier does not establish cable or PD-version qualification.Bank source · checked 2026-10-07 |
 | 140 W | 20 V / 5 A | Conditional rating-point matchThe bank dossier lists 20V / 5A at this port, covering the device’s published 20V / 1.5A system rating (30W). That numeric point does not by itself establish USB PD protocol qualification, device certification or actual load.Use a USB-C cable rated for this profile. The bank dossier does not establish cable or PD-version qualification.Bank source · checked 2026-10-07 |
Sourced energy planning
Estimate energy equivalents for 13-inch MacBook Air (M4, 2025)
Enter the bank’s explicitly published Wh rating and your own conversion-efficiency assumption. The formula applies that assumed loss once; it does not turn mAh into Wh or predict device behavior.
Device energy: 53.8 Wh from the OEM source. Source checked 2026-10-17.
Enter both values to calculate a fractional energy equivalent.
Formula: bank rated Wh × your efficiency assumption ÷ device battery Wh. The result is an arithmetic estimate from your inputs and the dated OEM battery figure above. A device may consume energy while running, and its charging system may stop at different levels.